(19)
(11) EP 0 648 746 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
26.04.1995 Bulletin 1995/17

(43) Date of publication A2:
19.04.1995 Bulletin 1995/16

(21) Application number: 94307355.1

(22) Date of filing: 06.10.1994
(51) International Patent Classification (IPC)6: C07D 213/57, C07C 255/40, C07D 239/30, C07C 255/17, C07D 333/24, C07D 405/12, C07D 241/44, C07C 323/20, C07C 323/52, C07D 213/64, C07D 295/18
// C07D277/68, C07C255/41, C07C271/64, A01N43/40, A01N39/00, A01N43/54, A01N43/60, A01N47/10, A01N43/74
(84) Designated Contracting States:
DE FR GB

(30) Priority: 08.10.1993 JP 253165/93

(71) Applicant: TOKUYAMA CORPORATION
Tokuyama-shi, Yamaguchi-ken 745 (JP)

(72) Inventors:
  • Kitajima, Toshio, c/o K.K. Tokuyama
    Yamaguchi-ken (JP)
  • Kobutani, Tadashi, c/o K.K. Tokuyama
    Yamaguchi-ken (JP)
  • Ishizaki, Masahiko, c/o K.K. Tokuyama
    Yamaguchi-ken (JP)
  • Kato, Shozo, c/o K.K. Tokuyama
    Yamaguchi-ken (JP)
  • Yamaguchi, Masao, c/o K.K. Tokuyama
    Yamaguchi-ken (JP)

(74) Representative: Votier, Sidney David 
CARPMAELS & RANSFORD 43, Bloomsbury Square
London WC1A 2RA
London WC1A 2RA (GB)


(56) References cited: : 
   
       


    (54) Cyanoketone derivative and herbicide containing it as an active component


    (57) A novel cyanoketone derivative of the following formula (1)


    wherein A₁ is a substituted or unsubstituted aromatic or heterocyclic group; each of X₁ and X₂ is independently an oxygen or sulfur atom; each of B₁, B₂ and B₃ is independently a hydrogen atom or an alkyl group; Y₁ is a hydrogen atom, a nitro group or a halogen atom; each of Y₂, Y₃ and Y₄ is independently a hydrogen atom, a halogen atom or an alkyl group; A₂ is among others, an alkyl group, an alkoxy group or a benzoyl group, provided that when B₁ is a hydrogen atom and B₂ is alkyl, the compound of the formula (1) is either of enantiomers with regard to the asymmetric carbon to which B₂ is bonded or a mixture of these enantiomers in an optional proportion.
    and a herbicide containing said derivative as an effective ingredient. The cyanoketone derivative of the present invention has a high selective herbicidal activity on broad-leaved weeds, but is safe for grasses such as wheat, corn and the like even when applied in a high dosage. Besides, said cyanoketone derivative is effective as a soil treating agent and a foliar treating agent when sprayed as a herbicide to the broad-leaved weeds.





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